Many of you guessed correctly. I'm working on a bunch of buzz saw blocks. I'm participating in a swap with some members of the online group to which I belong. You can see that the squares aren't sewn together. That's because we're sending them in groups of four so that they can be sewn together in scrappy fashion once they're returned.
If you intrested in trying a buzz saw block yourself, check out the link on my sidebar for a tutorial.